SL/R231: Rear Subframe Deterioration - Multiple Vehicles
Senior Member
Joined: Sep 2014
Posts: 349
Likes: 56
From: Massachusetts
1986 560SL, 2017 E300, 2018 Sl550, 2020 E350
HI CR
Tx for your response...comforting to know all Sis are covered.
One more question: Why do you think no reported issues yet regarding Sis....any difference in construction or materials of the sub frames on the SLs or just lighter use???
Tx for your response...comforting to know all Sis are covered.
One more question: Why do you think no reported issues yet regarding Sis....any difference in construction or materials of the sub frames on the SLs or just lighter use???
MBWorld Fanatic!
Joined: Dec 2015
Posts: 1,636
Likes: 522
From: Hagerstown MD
2015 SL400; 2019 X5M40i
1. Only driven in good weather
2. Located in areas with mild winters and thus avoid exposure to corrosive chemicals
3. Small numbers mean less documented cases
Member
Joined: Aug 2022
Posts: 111
Likes: 44
From: Bainsville, Ontario, Canada
SL 550 (2014) Kia Sorento (2016)
Seems like a few in the UK.
https://forums.mercedesclub.org.uk/i...2#post-2012113.
Mercedes has probably grouped cars into the recall that have a subframe with the same metallurgy and design and /or the same sub-supplier. I understand that the root cause are openings in the frame that allow moisture entry but the inside of the frame was never coated nor were adequate drain holes designed in. A look at the R172 headaches on 10+ year old cars will give you a heads up on what's to come.
https://forums.mercedesclub.org.uk/i...2#post-2012113.
Mercedes has probably grouped cars into the recall that have a subframe with the same metallurgy and design and /or the same sub-supplier. I understand that the root cause are openings in the frame that allow moisture entry but the inside of the frame was never coated nor were adequate drain holes designed in. A look at the R172 headaches on 10+ year old cars will give you a heads up on what's to come.
MBWorld Fanatic!
Joined: Feb 2021
Posts: 1,419
Likes: 739
From: Nor-Cal
2020 GLC300 -2014 Sl550 - 1997 SL600
SL63's use a different part. As my profile says, I'm in Nor Cal so we wouldn't see something like that out here.
I can also tell you corrosion such as this is typically caused by lack of oxygenation. i.e. dirt buildup, and then subsequent corrosion breaking down the painted/coated surfaces underneath. Brake lines are also subject to the same type of corrosion, and to be honest, see that as more of an issue for many cars, not just MB. Best way to prevent this is just making sure your undercarriage is clean. Nice pressure wash after winter is probably a good investment, if you live in those kinds of places with a lot of exposure to anti-icing products and dirt on the road.
See @rmorin49 post #27, as far as to probable reasons why no cases have been reported in the US.
As far as facelift cars being covered, looks like it covers pre-facelift cars only (see below). But would be surprised if they would deny a claim on a facelift car.
And as I mentioned above, same part number is used throughout ALL production years.
Last edited by crconsulting; Mar 26, 2023 at 12:46 PM.
